Abstract：Hydraulic fracturing is a key technology to develop shale gas and tight sandstone gas. With hydraulic fracture monitoring, we can get the fracture shape and orientation, which could improve the pertinence of hydraulic fracturing and guide the oilfield development. This paper describes the theory of tiltmeter mapping; and by referencing Okada's linear elastic theory and simulated annealing inversion method based on Monte Carlo method, we build three kinds of complicated hydraulic fracture models to simulate and analyze the surface deformation. Simulation results suggest that tiltmeter mapping could give an accurate estimation of the direction, size and distribution of the fracturing and would make up for the insufficiency of micro seismic method in fracture monitoring simulated reservoir volume (SRV). This work provides a new train of thought for the joint monitoring using micro seismic and tiltmeter mapping.
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